compare char

1. Define the macro in the header file;# Define Unicode# DEFINE _ Unicode2. Convert Char to wcharConst char * pfilepathname = "C: // AA. dll ";Int nlen = strlen (pfilepathname) + 1;Int nwlen = multibytetowidechar (cp_acp, 0, pfilepathname, nlen,

Charvarcharvarchar2 differences: 1. the length of CHAR is fixed, while the length of VARCHAR2 can be changed. For example, the storage string "abc", for CHAR (20 ), it indicates that the characters you store will occupy 20 bytes (including 17 null

Cstring to wchar_t Cstring Path = "ASDF "; Wchar_t wstr [1, 256] = path. allocsysstring (); Or: Wchar_t wcstring [256]; Multibytetowidechar (cp_acp, 0, path,-1, wcstring, 256 ); Wchar_t to cstring Widechartomultibyte (cp_acp, 0, wcstring, 256, Path.

Char varchar varchar2 the difference http://blog.csdn.net/honglei_zh/article/details/7172538Difference:1. The length of the char is fixed, and the length of the VARCHAR2 is changeable, for example, storing the string "abc", for Char (20), which

Comparison of data typesChar represents a fixed length, and the longest n-word varchar represents the actual length of the data type, such as: if it is a char type, when you enter a character that is less than the length, then a space is added, but

Binary negative Number:The original code is the original representation methodAnti-code is the inverse of the sign bit (highest bit)Complement = anti-code +1 1 bytes It can only represent 256 numbers anyway, because there is a sign, so we're going

1. The length of char is fixed, the length of the VARCHAR2 can vary, for example, the storage string "abc", for Char (20), which means that the characters you store will occupy 20 bytes (including 17 null characters), in the database it is occupied

(1) Overview String and cstring are both string template classes. string is a string class defined by the standard template class (STL) and has been incorporated into the C ++ standard; Cstring (typedef cstringt> cstring) is the most common string

  Many beginners are accustomed to using char variables to receive the return values of functions such as getchar, GETC, and fgetc. In fact, this is not correct, and it implies enoughFatal Error. The return value types of functions such as getchar

Many beginners are accustomed to using char variables to receive the return values of functions such as getchar, GETC, and fgetc. In fact, this is not correct, and it implies a fatal error. The return values of functions such as getchar are int type.